【摘要】 电阻点焊是车身装配最主要的手段,焊点质量好坏直接影响整车的性能。基于电极位移提出了一种电阻点焊实时闭环控制方法,利用高精度非接触式激光位移传感器及其相关控制电路,建立了热膨胀位移采集系统。基于最优电极位移曲线,采用PID控制算法,通过实时改变可控硅导通角来控制焊接控制器的各周波的焊接电流,控制焊点质量。针对双相高强钢DP600进行了试验,结果表明,该系统能够有效地控制焊接质量,保证了焊点的拉剪强度,并能有效抑制飞溅。更多还原

【Abstract】 Resistance spot welding(RSW) is the dominant way in body assembly,the quality of spot welds directly affects the capability of the whole vehicle.Based on the electrode displacement this paper brought forward a new real-time closed control method,which used high precision non-contact laser displacement sensor and the corresponding electrocircuit,then set up a displacement collection system based on the heat expand of the electrode.Based on the best electrode displacement curve,we used new control algorithm to change the welding current,then we can control the quality of the welding spots.We used the method in DP600 steel,the result proves that this system can effectively control the quality and restrain the splash.更多还原